Engine Light ON (or Service Engine Soon Warning Light),Engine hesitation
P0404 ISUZU Possible Causes
EGR volume control solenoid valve,EGR volume control solenoid valve harness is open or shorted,EGR volume control solenoid valve circuit poor electrical connection,EGR temperature sensor and circuit
P0404 ISUZU Description
Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control ??dule (EC?? Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum ??dulator. Depending on the engine and driving conditions, the EC??will control the EGR Solenoid which will operate the EGR Vacuum ??dulator to regulate the opening and closing of the EGR Valve. The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the EC?? Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the EC??does not issue the pulse signal. ??certain voltage signal is issued so that the valve remains at that particular opening.
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